president obama vowed to find those responsible for the bombing. >> any responsible individuals, any responsible groups will feel the full weight of justice. >> reporter: white house officials say they are treating the bombings as an act of terrorism. now, the city of boston is on high alert. very, very high alert around this city as it wakes up. new york city also area of high alert around subways and certain landmarks and sunday has the london marathon coming up and as for the city of boston the governor here deval patrick said city of boston will operate today but it will not be business as usual. >> i don't expect that. susan mcginnis in boston. thank you. >>> following the explosions in boston, security was tightened around the country. at the white house the secret service shut down access to pennsylvania avenue. patrol cars blocked entry points but the white house was not on lockdown and the park across the street remains open. in new york city, a police command truck was moved to times square. security was stepped up at landmarks like the empire state building and the world t